How To Wire Up A SP22S Shower Power Booster

How To Wire Up A Shower Power Booster SP22S.
Boosting a low pressure gravity system

[@Mickeyj26]

How do you wire it up so you just get the pump to work on what tap you turn on instead of when you turn the hot tap on the cold pump turns on and vice versa? Do you just use the 1st wire and not use the 4 way?

[@alandwright2]

You can get two automatic pumps to work separately which is fine if you want a very hot shower or a very cold shower but in the middle the temperature and pressures will surge hot and cold. To stop this you need the 4 way cable.